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Posts: 523 Join Date: Dec 2005 Location: San Antonio, Texas Real First Name: Guadalupe Camera: Canon 40d Can Others Edit My Photos: No iTrader Rating: 10 LIKES Received: 2 LIKES Given: 0 |
06-26-2009, 01:12 PM
I am off work today, so you will read a lot.
There are 2 DIY battery systems. That is, 2 Vivitars each with a dummy battery insert, each with a 6 volt battery, and 1 battery charger that charges both of them.
I have observed that the dead 6 volt battery (as pictured) can be recharged in approximately 3 hours with the Radio Shack wall charger (not pictured). Usually, this gets done during available idle time. The discharge nature of these batteries is slower than the common types we use. The life span is about 5-7 years and these have another 3 left in them. You'll get your money's worth. These are the same batteries that one would find inside a fire alarm cabinet in some buildings. How often does the fire alarm company come in to replace them? Typically, Altex Electronics sells them for $12.
As to how many "FULL" manual flashes? Now you are drawing on the part of me that I failed in college, math. I used these flashes in shooting HS basketball, and I shot two games in a night totaling about 530 photo flashes and spanning approximately 3 hours at 2 times a week. Is that enough for a photo shoot? Recharging them both was purely habit. I charged them once a month rarely checking the voltage levels.
Most flashes cannot handle the 4.5 amp push that Vivitars can. One of the contacts melted on my 430EX using this setup. I don't know about the present day Vivitars. Of course, with a "FULL" manual setting, you gotta wait about 4 seconds before firing the next shot. Using the 1/16th or 1/4th power setting on the knob allowed 2-3 second lapse between flashes. Actually, with good flash placement, I rarely used "FULL" manual mode. If you check out the Al Jacobs website, he has better info than I ever will.
For portability and quick setup and for a one-person photo shoot, these Vivitars may work out for most situations. There are adapters for adding accessories and carrying the strobist in you further than I did.
I hope this answers your question.
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Canon 40D. Tamron 17-50 F2.8, Sigma 50-150 F2.8 HSM, Custom Brackets QRS-35-SV Camera Rotating Bracket, Copper Hill Sensor Cleaner.
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